Ron You are sorely mistaken. Hyperlynx, ICX and ICX-Pro all use Mentor's Eldo Spice simulator for frequency dependent simulation, not some "behavorial simulator" as you incorrectly state. Eldo does perform accurate frequency and time domain simulation of lossy touchstone s-parameters. I'm not sure exactly what you mean when you talk about using a "single frequency attenuation factor". Frequency dependent loss is implicit in the real and imaginary portions of the s-parameter matrices. IIRC the Mentor algorithm fits s-parameters to a passive rational polynomial that will match the ADS convolution method in accuracy. At one time, you were correct that other methods did not offer the accuracy of the convolutional methods for the transient simulation of s-parameters. However, that has changed significantly in the past 5 years. Much good theoretical and practical work has been done in the industry on alternative methods based on pole-zero, state space. and hybrid convolutional methods for the transient simulation of s-parameters. ADS is a fine piece of software. However, there are also other simulators available that provide results that are just as accurate for transient simulations. regards, Scott Scott McMorrow Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 (401) 284-1827 Business (401) 284-1840 Fax http://www.teraspeed.com Teraspeed® is the registered service mark of Teraspeed Consulting Group LLC ron@xxxxxxxxxxx wrote: > Hi Bill and Cody > The beharioural simulators you mention do not accurately simulate the time > domain simulations. Where no great deal of accuracy is required these > simulatiors > provide a minimum level of assurance that a circuit may operate. > > The strength of the beharioural simulators is only in their fast > simulation time and > in the tie-in to the board layout software. Quick and easy but weak in > accuracy. > > Spice type simulators are quite a bit better, take more time to run but > do not > show frequency dependent loss. > > ALL THE SIMULATION TOOLS YOU USE, USE ONLY A SINGLE > FREQUENCY ATTENUATION FACTOR FOR ANY OF THE > S-PARAMETERS.. > > Only ADS uses a convolution of the impuse response obtained from the > S-Parameters to convert the the model back into the time domain.. Anything > less is only an approximation. > > Ron Miller > > > > > Hargin, Bill wrote: > > >> Hi Cody/Ron: >> >> >> >> >>>> Does anyone in the group know of any available software >>>> >>>> >>>> >>> packages that >>> >>> >>> >>>> can take post measurement S11 data and convert it to a time domain=20 >>>> reflected signal? >>>> >>>> >>>> >> While it's true that tools with RF roots perform this analysis, we've >> offered this functionality for years ourselves, and I'm sure there are >> several others offering this functionality ... 3 Mentor tools that do >> this: >> >> HyperLynx: Pre- and post-layout; Works in any PCB flow. >> ICX: Primarily for floorplanning and post-layout; Board Station and >> Expedition. >> ICX Pro: Pre- and post-layout; Tightly integrated into the Expedition >> flow. >> >> >> Bill Hargin >> High-Speed Marketing Manager >> Mentor Graphics Corp. >> Systems Design Division >> 425-301-4425 - Mobile=20 >> >> =20 >> >> >> >> >> >>> -----Original Message----- >>> From: si-list-bounce@xxxxxxxxxxxxx=20 >>> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of ron@xxxxxxxxxxx >>> Sent: Friday, December 21, 2007 3:51 PM >>> To: codymiller@xxxxxxxxxx >>> Cc: si-list@xxxxxxxxxxxxx >>> Subject: [SI-LIST] Re: S parameter to time domain signal >>> =20 >>> Hi Cody >>> =20 >>> ADS is the only tool that takes complex S-Parameter data as a=20 >>> model and simulates the time domain signals including reflections. >>> =20 >>> Call Agilent.... Lease is about 20K per year fully supported >>> =20 >>> Ron Miller >>> =20 >>> =20 >>> codymiller@xxxxxxxxxx wrote: >>> =20 >>> >>> >>> >>>> All, >>>> >>>> Does anyone in the group know of any available software=20 >>>> >>>> >>>> >>> packages that=20 >>> >>> >>> >>>> can take post measurement S11 data and convert it to a time domain=20 >>>> reflected signal? >>>> >>>> Thanks, >>>> Cody Miller >>>> ------------------------------------------------------------------ >>>> To unsubscribe from si-list: >>>> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >>>> >>>> or to administer your membership from a web page, go to: >>>> //www.freelists.org/webpage/si-list >>>> >>>> For help: >>>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >>>> >>>> >>>> List technical documents are available at: >>>> http://www.si-list.net >>>> >>>> List archives are viewable at: =20 >>>> //www.freelists.org/archives/si-list >>>> or at our remote archives: >>>> http://groups.yahoo.com/group/si-list/messages >>>> Old (prior to June 6, 2001) list archives are viewable at: >>>> http://www.qsl.net/wb6tpu >>>> =20 >>>> >>>> >>>> =20 >>>> >>>> >>>> >>>> >>> =20 >>> =20 >>> -- >>> Ronald B. Miller, Microwave/SI Engineer RAIL =3D NOISE + REFLECTIONS >>> Gigahertz Data Div of MI Corp. \\ // \\ //=20 >>> 7721 Sunset Avenue \\// \\// >>> Newark, CA 94560 ->JITTER<- EYE ->JITTER<- >>> tel 510-793-4744, //\\ //\\ >>> fax 510-742-6686 // \\ // \\ >>> www.ghzdata.com RAIL =3D NOISE + REFLECTIONS=20 >>> =20 >>> =09 >>> =09 >>> =20 >>> ------------------------------------------------------------------ >>> To unsubscribe from si-list: >>> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >>> =20 >>> or to administer your membership from a web page, go to: >>> //www.freelists.org/webpage/si-list >>> =20 >>> For help: >>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >>> =20 >>> =20 >>> List technical documents are available at: >>> http://www.si-list.net >>> =20 >>> List archives are viewable at: =20 >>> //www.freelists.org/archives/si-list >>> or at our remote archives: >>> http://groups.yahoo.com/group/si-list/messages >>> Old (prior to June 6, 2001) list archives are viewable at: >>> http://www.qsl.net/wb6tpu >>> =20 >>> =20 >>> =20 >>> >>> >>> >> ------------------------------------------------------------------ >> To unsubscribe from si-list: >> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >> >> or to administer your membership from a web page, go to: >> //www.freelists.org/webpage/si-list >> >> For help: >> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >> >> >> List technical documents are available at: >> http://www.si-list.net >> >> List archives are viewable at: >> //www.freelists.org/archives/si-list >> or at our remote archives: >> http://groups.yahoo.com/group/si-list/messages >> Old (prior to June 6, 2001) list archives are viewable at: >> http://www.qsl.net/wb6tpu >> >> >> >> >> >> > > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu